introduction n,n-dimethylcyclohexylamine (dmcha), represented by the chemical formula c8h17n, is a tertiary amine catalyst widely employed in the production of rigid polyurethane (pur) foams. its efficacy stems from its ability to accelerate both the urethane (polyol-isocyanate) and blowing (isocyanate-water) reactions, thereby influencing the foam’s cell structure, density, and overall mechanical properties. this article provides a...